Arrangement in a mobile machine for screeding floor surfaces

ABSTRACT

The invention relates to an arrangement in a mobile machine for screeding floor surfaces. This comprises a housing with a planet disk ( 3 ), which is rotatably supported in the bottom of the said housing and driven by a drive motor ( 1 ). The planet disk carries a number of rotatably supported screeding disks, distributed over the planet disk ( 3 ) and operatively connected to the drive motor ( 1 ). According to the invention the number of screeding disks is an even number up to a maximum of six. Viewed in the direction of rotation of the planet disk ( 3 ), half the number of screeding disks have a direction of rotation coinciding with the planet disk ( 3 ) and the remaining screeding disks an opposing direction of rotation.

FIELD OF THE INVENTION

The present invention relates to an arrangement according to thepre-characterising clauses of claims 1 and 3.

BACKGROUND OF THE INVENTION

Reference is made to U.S. Pat. No. 5,637,032 A, U.S. Pat. No. 1,069,803A, U.S. Pat. No. 4,097,950 A, FR 2073627 A5, FR 1108781 A as examples ofthe prior art.

Screeding machines of the aforementioned type function inherently well,but as the material in the screeding disks used to machine the floorsurfaces is progressively developed, thereby enabling it to remove morefloor material per unit time than before, there is a desire for moreavailable power for machining of the floor material.

BRIEF SUMMARY OF THE INVENTION

The object of the present invention is to produce an arrangement in ascreeding machine of the type referred to in the introductory part,which has an improved removal capability compared to known screedingmachines. This is achieved in that the arrangement has thecharacteristic features specified in the characterising part of claims 1and 3.

The arrangement according to the invention furthermore has one or moreof the characteristic features specified in the subordinate claims.

The invention moreover affords the following advantages:

The screeding machine designed according to the invention has animproved balance and reduced lateral rotation, which especially in thecase of a manually operated machine makes it easier to hold and control.More even screeding is achieved; with known machines it is easy to endup with a machining mark having a plate-shaped cross-section, whichmeans that it is necessary to screed with a relatively large overlap, inorder to obtain a plane finish.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

The invention will be explained in more detail below with reference tothe drawing attached, in which

FIG. 1 a, in an oblique, perspective view from beneath, shows by way ofexample a screeding unit in a screeding machine according to theinvention, having a drive motor and a dished planet disk, whichaccommodates a belt transmission.

FIG. 1 b shows the drive motor and the planet disk in FIG. 1 a in anoblique perspective view from above.

FIG. 1 c shows essentially the same view as FIG. 1 a, but the planetdisk and the belt transmission are covered by a cover plate withopenings for the machine's screeding disks.

FIG. 2, by way of an example, shows a plan view of a system of belts fordriving the screeding machine planet disk and screeding disks of thetype used in the embodiment according to FIGS. 1 a, 1 b.

FIG. 3 in a side view illustrates an embodiment of a screeding unitaccording to the invention, in which the screeding unit planet disk isdriven by a separate drive motor.

In FIGS. 1 a, 1 b, 1 denotes a drive motor mounted on a motor plate 2.The motor plate 2 is designed to be fitted in a screeding machinecasing, not shown further, by means of a screw nut connection.

DETAILED DESCRIPTION OF THE INVENTION

3 denotes a planet disk, which is supported so that it can rotate inrelation to the motor plate 2 and is shaped like a dish open at thebottom. When the screeding unit is ready for use the dish is covered bya protective plate having openings for the screeding disks. The dishwith the protective plate forms a protected space for the drivemechanism, as will be explained below. This space accommodates foursymmetrically located holders 4 a 1–4 a 4 for screeding disks 4 c 1–4 c4, the holders being supported so that they can rotate, in the planetdisk 3. For the sake of clarity, the screeding disks have been omittedfrom FIG. 1 a but are shown in FIG. 1 c, in which the directions ofrotation, according to the invention, of the screeding disks 4 c 1–4 c 4and the planet disk 3 are also illustrated by arrows 3 p and 4 prespectively. 3 a denotes a plate having openings for the screedingdisks 4 c 1–4 c 4, designed to protect the belt transmissions in thedished planet disk 3. A belt sheave 4 b 1–4 b 4 is connected to eachholder 4 a 1–4 a 4 for driving each screeding disk in the mannercharacteristic of the invention. A belt 6 runs over the belt sheaves 4 b1–4 b 4 and over deflection sheaves 5 arranged between them. A beltsheave 1 a arranged on the shaft of the motor 1 is designed to drive thebelt sheave 4 b 2 by way of a belt 7, thereby causing the other beltsheaves to rotate. Since the belt 6 runs over that section of thecircumference situated nearest to the centre of the planet disk 3 inrespect of the belt sheaves 4 b 1 and 4 b 3 and over the section of thecircumference situated furthest away from the said centre in respect ofthe belt sheaves 4 b 2 and 4 b 4, the belt sheaves 4 b 1, 4 b 3 assumeopposing directions of rotation relative to the belt sheaves 4 b 2, 4 b4, thereby providing the characteristic feature of the presentinvention, namely that adjacent screeding disks have opposite directionsof rotation.

From FIG. 1 bit can be seen that shafts of the belt sheaves 4 b 1, 4 b 3protrude from the dished planet disk 3 and form belt sheaves 8. 9denotes a belt sheave fixed to the motor plate 2. A belt 10, by means ofwhich the rotation of the motor 1 is transmitted to the planet disk 3 byway of the belt sheave 1 a, the belt 7, the belt sheave 4 a 2, the belt6 and the belt sheaves 4 b 1, 4 b 3, runs over the belt sheaves 8 and 9.It may be noted in this connection that the planet sheave 3 has the samedirection of rotation as the screeding disks 4 c 2, 4 c 4. From this itfollows that these screeding disks in an area furthest away from thecentre of the planet disk 3 have a higher peripheral speed in relationto a surface that is to be screeded than do the screeding disks 4 c 1, 4c 3 in the same area. If so required, this can, as the person skilled inthe art will appreciate, be compensated for by giving the belt sheaves 4b 1, 4 b 3 and 4 b 2, 4 b 4 correspondingly different diameters. For thesake of clarity all belts and belt sheaves are drawn in FIG. 2.

The person skilled in the art will also appreciate that some or all ofthe belt transmissions may be replaced by gear transmissions ortransmissions having a frictional engagement.

It will also be appreciated that, without departing from the idea of theinvention, six screeding disks supported by holders may be arranged onthe planet wheel 3, each holder being connected to s belt sheave. A beltruns over the belt sheaves and over intermediate deflection sheaves inthe manner already explained, which means that adjacent screeding diskshave opposite directions of rotation. At the same time the planet diskcarrying the screeding disks is driven in the same way as explainedearlier. In this embodiment also, the belt transmissions can be replacedwholly or in part by gear transmissions or transmissions having africtional engagement.

In a particular embodiment of the arrangement according to theinvention, the planet disk 3 is driven by its own motor 11. The belt 10,which in the embodiment according to FIGS. 1 a, 1 b runs over beltsheaves 8, then runs instead over the belt sheave 11 a of the motor 11.Separate driving of the planet disk 3 affords two advantages: firstly itis possibly to freely select the direction of rotation of the planetdisk 3 and secondly the speed of rotation can be selected irrespectiveof the speed of the screeding disks, in order obtain the optimumscreeding result. A gear transmission can obviously also be used in thisembodiment instead of the belt transmission.

Although the invention above has been primarily illustrated andexplained in connection with a screeding unit for a manually operatedscreeding machine, it will be obvious that the screeding unit accordingto the invention affords the same advantages when it is fitted to apowered screeding machine. It is also advantageous here that lateralforces occurring are minimised and that the effective screeding profileof the screeding unit permits screeding with little overlap.

1. An arrangement in a mobile machine for screeding floor surfacescomprising: a housing with a planet disk rotatably supported in thebottom of the housing and driven by a drive motor, and which carries aneven number of up to six but not less than four screeding disks,operatively connected to the drive motor and defining one screedingplane, wherein the operative connection comprises: belt sheaves, whereina belt sheave is associated with each of the screeding disks, deflectionsheaves arranged between the belt sheaves, a first belt arranged suchthat the first belt bears against a part of the circumferences of thebelt sheaves and against a part of the circumferences of the deflectionsheaves, wherein the first belt alternates from belt sheave to beltsheave and lies alternately closest to the center of the planet disk andfurthest away from the center of the planet disk and wherein the firstbelt lies furthest from the center when bearing against the deflectionsheaves, and a second belt running between a belt sheave arranged on theshaft of the motor and one of the belt sheaves belonging to thescreeding disks.
 2. An arrangement in a mobile machine for screedingfloor surfaces comprising: a housing with a planet disk rotatablysupported in the bottom of the housing and driven by a drive motor, andwhich carries an even number of up to six but not less than fourscreeding disks, operatively connected to the drive motor and definingone screeding plane, wherein the operative connection comprises: beltsheaves, wherein a belt sheave is associated with each of the screedingdisks, deflection sheaves arranged between the belt sheaves, a firstbelt arranged such that the first belt bears against a part of thecircumferences of the belt sheaves and against a part of thecircumferences of the deflection sheaves, wherein the first beltalternates from belt sheave to belt sheave and lies alternately closestto the center of the planet disk and furthest away from the center ofthe planet disk and wherein the first belt lies furthest from the centerwhen bearing against the deflection sheaves, and a second belt runningbetween a belt sheave arranged on the shaft of the motor and one of thebelt sheaves belonging to the screeding disks, wherein the screedingdisks that have a direction of rotation opposed to the planet disk havea rotational speed, which is so much greater than the rotational speedof the screeding disks that have the same direction of rotation as theplanet disk, and that at the periphery of the planet disk all screedingdisks have approximately the same peripheral speed in relation to thesurface that is to be screeded.
 3. An arrangement in a mobile machinefor screeding floor surfaces comprising: a housing with a planet disk,which is rotatably supported in the bottom of the housing and whichcarries a number of rotatably supported screeding disks, distributedover said planet disk and operatively connected to a drive motor, anddefining one screeding plane, wherein the planet disk is operativelyconnected to a second drive motor, intended solely for driving theplanet disk, and wherein the number of screeding disks constitutes aneven number up to a maximum of six, half the number of screeding diskshave a direction of rotation coinciding with the planet disk and theremaining screeding disks an opposing direction of rotation.
 4. Anarrangement according to claim 3, wherein the operative connectionbetween the planet disk and its drive motor comprises a belt or geartransmission.
 5. A mobile machine for screeding floor surfacescomprising: a housing with a planet disk rotatably supported in thebottom of the housing and carrying a number of rotatably supportedscreeding disks, distributed over said planet disk and operativelyconnected to a drive motor fixedly connected to a motor plate, anddefining one screeding plane, wherein the number of screeding disksconstitutes an even number up to a maximum of six, half the number ofscreeding disks have a direction of rotation coinciding with the planetdisk and the remaining screeding disks an opposing direction ofrotation, and a transmission arranged to connect two of said screedingdisks having the same direction of rotation to the motor plate, suchthat rotation of said two screeding discs is transmitted to the motorplate, to rotate the planet disk relative to the motor plate and,wherein the transmission comprises respective first and second beltsheaves connected to a respective one of said screeding disks having thesame direction of rotation, a third belt sheave mounted to the motorplate and a belt arranged between and in contact with said first, secondand third belt sheaves.
 6. The mobile machine for screeding floorsurfaces as claimed in claim 5, wherein said planet disk comprises ahollow disk-shaped body, which when in use is arranged substantially inparallel with the floor surface.
 7. The mobile machine for screedingfloor surfaces as claimed in claim 6, wherein said screeding disks arearranged on a lower side of the planet disk, and wherein the first andsecond belt sheaves are arranged on an upper side of the planet disk. 8.The mobile machine for screeding floor surfaces as claimed in claim 7,wherein said first and second belt sheaves are arranged on a respectiveshaft of a respective one of said screeding disks.
 9. The mobile machinefor screeding floor surfaces as claimed in claim 8, wherein said shaftsprotrude through the planet disk to the upper side of the planet disk.10. The mobile machine for screeding floor surfaces as claimed in claim5, wherein said two screeding disks having the same direction ofrotation are arranged on opposite sides of the motor plate.